如何使用INSERT INTO多次选择插入？

Question

我试图插入每两个数据中的每个字段的表如下：

INSERT INTO `wp_postmeta` (post_id, meta_key, meta_value) 
SELECT post_id, 'custom', custom 
SELECT post_id, '_custom', 'field_514e91e73640d' 
FROM `wp_temp` 
WHERE custom IS NOT NULL 

但是，这是行不通的。无论如何要在MySQL的一个查询中实现这一点？谢谢。

Answer 1

INSERT INTO `wp_postmeta` (post_id, meta_key, meta_value) 
SELECT post_id, 'custom', custom FROM `wp_temp` WHERE custom IS NOT NULL 
UNION ALL 
SELECT post_id, '_custom', 'field_514e91e73640d' FROM `wp_temp` WHERE custom IS NOT NULL 

Answer 2

是用UNION ALL

INSERT INTO `wp_postmeta` (post_id, meta_key, meta_value) 
SELECT post_id, '_custom', 'field_514e91e73640d' 
FROM `wp_temp` 
WHERE custom IS NOT NULL 

UNION ALL 

SELECT post_id, 'custom', custom 
FROM `wp_temp` 
WHERE custom IS NOT NULL 

Answer 3

您将需要每个SELECT独立FROM和WHERE条款，但它可能与UNION或UNION ALL。

INSERT INTO `wp_postmeta` (post_id, meta_key, meta_value) 
SELECT post_id, 'custom', custom 
FROM `wp_temp` 
WHERE custom IS NOT NULL 
UNION 
SELECT post_id, '_custom', 'field_514e91e73640d' 
FROM `wp_temp` 
WHERE custom IS NOT NULL